redemptive-historical approach to Scripture is that all of Scripture reveals a redeeming God of grace who has worked unalterably for the redemption of people by delivering them from both the penalty and the power of sin. On this basis the history recorded in Scripture is searched for the continuing stream of God’s redemptive work, and didactic books of the Bible are regarded as expounding the more foundational historical books. Thus Jesus rebuked his disciples for being “foolish” and “slow of heart